Genetic analysis of fertility and average daily gain in rabbit dam | Análisis genético de los caracteres de fertilidad y velocidad de crecimiento en la hembra de conejo
2009
Tusell, L., Institut de Recerca i Tecnologia Agroalimentàries, Caldes de Montbui, Barcelona (España). Cunicultura | Rafael, O., Institut de Recerca i Tecnologia Agroalimentàries, Caldes de Montbui, Barcelona (España). Cunicultura | Ramón, J., Institut de Recerca i Tecnologia Agroalimentàries, Caldes de Montbui, Barcelona (España). Cunicultura | Piles, M., Institut de Recerca i Tecnologia Agroalimentàries, Caldes de Montbui, Barcelona (España). Cunicultura
A Bayesian bivariate Linear-Threshold Animal Model was performed to determine the genetic correlation between doe fertility (F) and average daily gain (ADG) in a rabbit line selected for growth rate during the fattening period. The model used for ADG included the systematic effects of year-season, parity order and number of kids born alive, the animal additive effect, the maternal genetic plus permanent environmental effects and the environmental permanent effect of litter and the random residual effect. The model for the underlying variable for F included the systematic effects of year-season and physiological status of the female, the female additive genetic effects, the female non additive genetic plus permanent environmental effects and the residual, which was divided in an environmental permanent effect related with the environmental permanent effect of litter for ADG, and a random residual term. The obtained heritabilities were 0.04 and 0.14 for F and ADG, respectively. The genetic correlation was low and negative (-0.12) with a probability of 88% of being lower than 0. Thus, the negative value of the genetic correlation seems not to be enough to consider that female reproductive performance is being affected by the selection for growth traits in rabbit lines.
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